src/mesa/state_tracker/st_format.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * Copyright (c) 2008-2010 VMware, Inc.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29
  30 /**
  31  * Mesa / Gallium format conversion and format selection code.
  32  * \author Brian Paul
  33  */
  34
  35 #include "main/imports.h"
  36 #include "main/context.h"
  37 #include "main/texstore.h"
  38 #include "main/image.h"
  39 #include "main/macros.h"
  40
  41 #include "pipe/p_context.h"
  42 #include "pipe/p_defines.h"
  43 #include "pipe/p_screen.h"
  44 #include "util/u_format.h"
  45 #include "st_context.h"
  46 #include "st_format.h"
  47
  48
  49 static GLuint
  50 format_max_bits(enum pipe_format format)
  51 {
  52    GLuint size = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0);
  53
  54    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 1));
  55    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 2));
  56    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3));
  57    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0));
  58    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1));
  59    return size;
  60 }
  61
  62
  63 /**
  64  * Return basic GL datatype for the given gallium format.
  65  */
  66 GLenum
  67 st_format_datatype(enum pipe_format format)
  68 {
  69    const struct util_format_description *desc;
  70
  71    desc = util_format_description(format);
  72    assert(desc);
  73
  74    if (desc->layout == UTIL_FORMAT_LAYOUT_PLAIN) {
  75       if (format == PIPE_FORMAT_B5G5R5A1_UNORM ||
  76           format == PIPE_FORMAT_B5G6R5_UNORM) {
  77          return GL_UNSIGNED_SHORT;
  78       }
  79       else if (format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
  80                format == PIPE_FORMAT_S8_USCALED_Z24_UNORM ||
  81                format == PIPE_FORMAT_Z24X8_UNORM ||
  82                format == PIPE_FORMAT_X8Z24_UNORM) {
  83          return GL_UNSIGNED_INT_24_8;
  84       }
  85       else {
  86          const GLuint size = format_max_bits(format);
  87          if (size == 8) {
  88             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
  89                return GL_UNSIGNED_BYTE;
  90             else
  91                return GL_BYTE;
  92          }
  93          else if (size == 16) {
  94             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
  95                return GL_UNSIGNED_SHORT;
  96             else
  97                return GL_SHORT;
  98          }
  99          else {
 100             assert( size <= 32 );
 101             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
 102                return GL_UNSIGNED_INT;
 103             else
 104                return GL_INT;
 105          }
 106       }
 107    }
 108    else if (format == PIPE_FORMAT_UYVY) {
 109       return GL_UNSIGNED_SHORT;
 110    }
 111    else if (format == PIPE_FORMAT_YUYV) {
 112       return GL_UNSIGNED_SHORT;
 113    }
 114    else {
 115       /* compressed format? */
 116       assert(0);
 117    }
 118
 119    assert(0);
 120    return GL_NONE;
 121 }
 122
 123
 124 /**
 125  * Translate Mesa format to Gallium format.
 126  */
 127 enum pipe_format
 128 st_mesa_format_to_pipe_format(gl_format mesaFormat)
 129 {
 130    switch (mesaFormat) {
 131    case MESA_FORMAT_RGBA8888:
 132       return PIPE_FORMAT_A8B8G8R8_UNORM;
 133    case MESA_FORMAT_RGBA8888_REV:
 134       return PIPE_FORMAT_R8G8B8A8_UNORM;
 135    case MESA_FORMAT_ARGB8888:
 136       return PIPE_FORMAT_B8G8R8A8_UNORM;
 137    case MESA_FORMAT_ARGB8888_REV:
 138       return PIPE_FORMAT_A8R8G8B8_UNORM;
 139    case MESA_FORMAT_XRGB8888:
 140       return PIPE_FORMAT_B8G8R8X8_UNORM;
 141    case MESA_FORMAT_XRGB8888_REV:
 142       return PIPE_FORMAT_X8R8G8B8_UNORM;
 143    case MESA_FORMAT_ARGB1555:
 144       return PIPE_FORMAT_B5G5R5A1_UNORM;
 145    case MESA_FORMAT_ARGB4444:
 146       return PIPE_FORMAT_B4G4R4A4_UNORM;
 147    case MESA_FORMAT_RGB565:
 148       return PIPE_FORMAT_B5G6R5_UNORM;
 149    case MESA_FORMAT_AL88:
 150       return PIPE_FORMAT_L8A8_UNORM;
 151    case MESA_FORMAT_A8:
 152       return PIPE_FORMAT_A8_UNORM;
 153    case MESA_FORMAT_L8:
 154       return PIPE_FORMAT_L8_UNORM;
 155    case MESA_FORMAT_I8:
 156       return PIPE_FORMAT_I8_UNORM;
 157    case MESA_FORMAT_Z16:
 158       return PIPE_FORMAT_Z16_UNORM;
 159    case MESA_FORMAT_Z32:
 160       return PIPE_FORMAT_Z32_UNORM;
 161    case MESA_FORMAT_Z24_S8:
 162       return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 163    case MESA_FORMAT_S8_Z24:
 164       return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 165    case MESA_FORMAT_Z24_X8:
 166       return PIPE_FORMAT_X8Z24_UNORM;
 167    case MESA_FORMAT_X8_Z24:
 168       return PIPE_FORMAT_Z24X8_UNORM;
 169    case MESA_FORMAT_YCBCR:
 170       return PIPE_FORMAT_UYVY;
 171 #if FEATURE_texture_s3tc
 172    case MESA_FORMAT_RGB_DXT1:
 173       return PIPE_FORMAT_DXT1_RGB;
 174    case MESA_FORMAT_RGBA_DXT1:
 175       return PIPE_FORMAT_DXT1_RGBA;
 176    case MESA_FORMAT_RGBA_DXT3:
 177       return PIPE_FORMAT_DXT3_RGBA;
 178    case MESA_FORMAT_RGBA_DXT5:
 179       return PIPE_FORMAT_DXT5_RGBA;
 180 #if FEATURE_EXT_texture_sRGB
 181    case MESA_FORMAT_SRGB_DXT1:
 182       return PIPE_FORMAT_DXT1_SRGB;
 183    case MESA_FORMAT_SRGBA_DXT1:
 184       return PIPE_FORMAT_DXT1_SRGBA;
 185    case MESA_FORMAT_SRGBA_DXT3:
 186       return PIPE_FORMAT_DXT3_SRGBA;
 187    case MESA_FORMAT_SRGBA_DXT5:
 188       return PIPE_FORMAT_DXT5_SRGBA;
 189 #endif
 190 #endif
 191 #if FEATURE_EXT_texture_sRGB
 192    case MESA_FORMAT_SLA8:
 193       return PIPE_FORMAT_L8A8_SRGB;
 194    case MESA_FORMAT_SL8:
 195       return PIPE_FORMAT_L8_SRGB;
 196    case MESA_FORMAT_SRGB8:
 197       return PIPE_FORMAT_R8G8B8_SRGB;
 198    case MESA_FORMAT_SRGBA8:
 199       return PIPE_FORMAT_A8B8G8R8_SRGB;
 200    case MESA_FORMAT_SARGB8:
 201       return PIPE_FORMAT_B8G8R8A8_SRGB;
 202 #endif
 203    default:
 204       assert(0);
 205       return PIPE_FORMAT_NONE;
 206    }
 207 }
 208
 209
 210 /**
 211  * Translate Gallium format to Mesa format.
 212  */
 213 gl_format
 214 st_pipe_format_to_mesa_format(enum pipe_format format)
 215 {
 216    switch (format) {
 217    case PIPE_FORMAT_A8B8G8R8_UNORM:
 218       return MESA_FORMAT_RGBA8888;
 219    case PIPE_FORMAT_R8G8B8A8_UNORM:
 220       return MESA_FORMAT_RGBA8888_REV;
 221    case PIPE_FORMAT_B8G8R8A8_UNORM:
 222       return MESA_FORMAT_ARGB8888;
 223    case PIPE_FORMAT_A8R8G8B8_UNORM:
 224       return MESA_FORMAT_ARGB8888_REV;
 225    case PIPE_FORMAT_B8G8R8X8_UNORM:
 226       return MESA_FORMAT_XRGB8888;
 227    case PIPE_FORMAT_X8R8G8B8_UNORM:
 228       return MESA_FORMAT_XRGB8888_REV;
 229    case PIPE_FORMAT_B5G5R5A1_UNORM:
 230       return MESA_FORMAT_ARGB1555;
 231    case PIPE_FORMAT_B4G4R4A4_UNORM:
 232       return MESA_FORMAT_ARGB4444;
 233    case PIPE_FORMAT_B5G6R5_UNORM:
 234       return MESA_FORMAT_RGB565;
 235    case PIPE_FORMAT_L8A8_UNORM:
 236       return MESA_FORMAT_AL88;
 237    case PIPE_FORMAT_A8_UNORM:
 238       return MESA_FORMAT_A8;
 239    case PIPE_FORMAT_L8_UNORM:
 240       return MESA_FORMAT_L8;
 241    case PIPE_FORMAT_I8_UNORM:
 242       return MESA_FORMAT_I8;
 243    case PIPE_FORMAT_S8_USCALED:
 244       return MESA_FORMAT_S8;
 245
 246    case PIPE_FORMAT_R16G16B16A16_SNORM:
 247       return MESA_FORMAT_SIGNED_RGBA_16;
 248
 249    case PIPE_FORMAT_Z16_UNORM:
 250       return MESA_FORMAT_Z16;
 251    case PIPE_FORMAT_Z32_UNORM:
 252       return MESA_FORMAT_Z32;
 253    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 254       return MESA_FORMAT_Z24_S8;
 255    case PIPE_FORMAT_X8Z24_UNORM:
 256       return MESA_FORMAT_Z24_X8;
 257    case PIPE_FORMAT_Z24X8_UNORM:
 258       return MESA_FORMAT_X8_Z24;
 259    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 260       return MESA_FORMAT_S8_Z24;
 261
 262    case PIPE_FORMAT_UYVY:
 263       return MESA_FORMAT_YCBCR;
 264    case PIPE_FORMAT_YUYV:
 265       return MESA_FORMAT_YCBCR_REV;
 266
 267 #if FEATURE_texture_s3tc
 268    case PIPE_FORMAT_DXT1_RGB:
 269       return MESA_FORMAT_RGB_DXT1;
 270    case PIPE_FORMAT_DXT1_RGBA:
 271       return MESA_FORMAT_RGBA_DXT1;
 272    case PIPE_FORMAT_DXT3_RGBA:
 273       return MESA_FORMAT_RGBA_DXT3;
 274    case PIPE_FORMAT_DXT5_RGBA:
 275       return MESA_FORMAT_RGBA_DXT5;
 276 #if FEATURE_EXT_texture_sRGB
 277    case PIPE_FORMAT_DXT1_SRGB:
 278       return MESA_FORMAT_SRGB_DXT1;
 279    case PIPE_FORMAT_DXT1_SRGBA:
 280       return MESA_FORMAT_SRGBA_DXT1;
 281    case PIPE_FORMAT_DXT3_SRGBA:
 282       return MESA_FORMAT_SRGBA_DXT3;
 283    case PIPE_FORMAT_DXT5_SRGBA:
 284       return MESA_FORMAT_SRGBA_DXT5;
 285 #endif
 286 #endif
 287
 288 #if FEATURE_EXT_texture_sRGB
 289    case PIPE_FORMAT_L8A8_SRGB:
 290       return MESA_FORMAT_SLA8;
 291    case PIPE_FORMAT_L8_SRGB:
 292       return MESA_FORMAT_SL8;
 293    case PIPE_FORMAT_R8G8B8_SRGB:
 294       return MESA_FORMAT_SRGB8;
 295    case PIPE_FORMAT_A8B8G8R8_SRGB:
 296       return MESA_FORMAT_SRGBA8;
 297    case PIPE_FORMAT_B8G8R8A8_SRGB:
 298       return MESA_FORMAT_SARGB8;
 299 #endif
 300    default:
 301       assert(0);
 302       return MESA_FORMAT_NONE;
 303    }
 304 }
 305
 306
 307 /**
 308  * Return first supported format from the given list.
 309  */
 310 static enum pipe_format
 311 find_supported_format(struct pipe_screen *screen,
 312                       const enum pipe_format formats[],
 313                       uint num_formats,
 314                       enum pipe_texture_target target,
 315                       unsigned sample_count,
 316                       unsigned tex_usage,
 317                       unsigned geom_flags)
 318 {
 319    uint i;
 320    for (i = 0; i < num_formats; i++) {
 321       if (screen->is_format_supported(screen, formats[i], target,
 322                                       sample_count, tex_usage, geom_flags)) {
 323          return formats[i];
 324       }
 325    }
 326    return PIPE_FORMAT_NONE;
 327 }
 328
 329
 330 /**
 331  * Find an RGBA format supported by the context/winsys.
 332  */
 333 static enum pipe_format
 334 default_rgba_format(struct pipe_screen *screen,
 335                     enum pipe_texture_target target,
 336                     unsigned sample_count,
 337                     unsigned tex_usage,
 338                     unsigned geom_flags)
 339 {
 340    static const enum pipe_format colorFormats[] = {
 341       PIPE_FORMAT_B8G8R8A8_UNORM,
 342       PIPE_FORMAT_A8R8G8B8_UNORM,
 343       PIPE_FORMAT_A8B8G8R8_UNORM,
 344       PIPE_FORMAT_B5G6R5_UNORM
 345    };
 346    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 347                                 target, sample_count, tex_usage, geom_flags);
 348 }
 349
 350
 351 /**
 352  * Find an RGB format supported by the context/winsys.
 353  */
 354 static enum pipe_format
 355 default_rgb_format(struct pipe_screen *screen,
 356                    enum pipe_texture_target target,
 357                    unsigned sample_count,
 358                    unsigned tex_usage,
 359                    unsigned geom_flags)
 360 {
 361    static const enum pipe_format colorFormats[] = {
 362       PIPE_FORMAT_B8G8R8X8_UNORM,
 363       PIPE_FORMAT_X8R8G8B8_UNORM,
 364       PIPE_FORMAT_X8B8G8R8_UNORM,
 365       PIPE_FORMAT_B8G8R8A8_UNORM,
 366       PIPE_FORMAT_A8R8G8B8_UNORM,
 367       PIPE_FORMAT_A8B8G8R8_UNORM,
 368       PIPE_FORMAT_B5G6R5_UNORM
 369    };
 370    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 371                                 target, sample_count, tex_usage, geom_flags);
 372 }
 373
 374 /**
 375  * Find an sRGBA format supported by the context/winsys.
 376  */
 377 static enum pipe_format
 378 default_srgba_format(struct pipe_screen *screen,
 379                     enum pipe_texture_target target,
 380                     unsigned sample_count,
 381                     unsigned tex_usage,
 382                     unsigned geom_flags)
 383 {
 384    static const enum pipe_format colorFormats[] = {
 385       PIPE_FORMAT_B8G8R8A8_SRGB,
 386       PIPE_FORMAT_A8R8G8B8_SRGB,
 387       PIPE_FORMAT_A8B8G8R8_SRGB,
 388    };
 389    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 390                                 target, sample_count, tex_usage, geom_flags);
 391 }
 392
 393
 394 /**
 395  * Given an OpenGL internalFormat value for a texture or surface, return
 396  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
 397  * This is called during glTexImage2D, for example.
 398  *
 399  * The bindings parameter typically has PIPE_BIND_SAMPLER_VIEW set, plus
 400  * either PIPE_BINDING_RENDER_TARGET or PIPE_BINDING_DEPTH_STENCIL if
 401  * we want render-to-texture ability.
 402  *
 403  * \param internalFormat  the user value passed to glTexImage2D
 404  * \param target  one of PIPE_TEXTURE_x
 405  * \param bindings  bitmask of PIPE_BIND_x flags.
 406  */
 407 enum pipe_format
 408 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 409                  enum pipe_texture_target target, unsigned sample_count,
 410                  unsigned bindings)
 411 {
 412    unsigned geom_flags = 0; /* we don't care about POT vs. NPOT here, yet */
 413
 414    switch (internalFormat) {
 415    case 4:
 416    case GL_RGBA:
 417    case GL_RGBA8:
 418    case GL_RGB10_A2:
 419    case GL_RGBA12:
 420       return default_rgba_format( screen, target, sample_count, bindings,
 421                                   geom_flags );
 422    case 3:
 423    case GL_RGB:
 424       return default_rgb_format( screen, target, sample_count, bindings,
 425                                  geom_flags );
 426    case GL_RGBA16:
 427       return default_rgba_format( screen, target, sample_count, bindings,
 428                                   geom_flags );
 429
 430    case GL_RGBA4:
 431    case GL_RGBA2:
 432       if (screen->is_format_supported( screen, PIPE_FORMAT_B4G4R4A4_UNORM,
 433                                        target, sample_count, bindings,
 434                                        geom_flags ))
 435          return PIPE_FORMAT_B4G4R4A4_UNORM;
 436       return default_rgba_format( screen, target, sample_count, bindings,
 437                                   geom_flags );
 438
 439    case GL_RGB5_A1:
 440       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM,
 441                                        target, sample_count, bindings,
 442                                        geom_flags ))
 443          return PIPE_FORMAT_B5G5R5A1_UNORM;
 444       return default_rgba_format( screen, target, sample_count, bindings,
 445                                   geom_flags );
 446
 447    case GL_RGB8:
 448    case GL_RGB10:
 449    case GL_RGB12:
 450    case GL_RGB16:
 451       return default_rgb_format( screen, target, sample_count, bindings,
 452                                  geom_flags );
 453
 454    case GL_RGB5:
 455    case GL_RGB4:
 456    case GL_R3_G3_B2:
 457       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G6R5_UNORM,
 458                                        target, sample_count, bindings,
 459                                        geom_flags ))
 460          return PIPE_FORMAT_B5G6R5_UNORM;
 461       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM,
 462                                        target, sample_count, bindings,
 463                                        geom_flags ))
 464          return PIPE_FORMAT_B5G5R5A1_UNORM;
 465       return default_rgba_format( screen, target, sample_count, bindings,
 466                                   geom_flags );
 467
 468    case GL_ALPHA:
 469    case GL_ALPHA4:
 470    case GL_ALPHA8:
 471    case GL_ALPHA12:
 472    case GL_ALPHA16:
 473    case GL_COMPRESSED_ALPHA:
 474       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target,
 475                                        sample_count, bindings, geom_flags ))
 476          return PIPE_FORMAT_A8_UNORM;
 477       return default_rgba_format( screen, target, sample_count, bindings,
 478                                   geom_flags );
 479
 480    case 1:
 481    case GL_LUMINANCE:
 482    case GL_LUMINANCE4:
 483    case GL_LUMINANCE8:
 484    case GL_LUMINANCE12:
 485    case GL_LUMINANCE16:
 486    case GL_COMPRESSED_LUMINANCE:
 487       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target,
 488                                        sample_count, bindings, geom_flags ))
 489          return PIPE_FORMAT_L8_UNORM;
 490       return default_rgba_format( screen, target, sample_count, bindings,
 491                                   geom_flags );
 492
 493    case 2:
 494    case GL_LUMINANCE_ALPHA:
 495    case GL_LUMINANCE4_ALPHA4:
 496    case GL_LUMINANCE6_ALPHA2:
 497    case GL_LUMINANCE8_ALPHA8:
 498    case GL_LUMINANCE12_ALPHA4:
 499    case GL_LUMINANCE12_ALPHA12:
 500    case GL_LUMINANCE16_ALPHA16:
 501    case GL_COMPRESSED_LUMINANCE_ALPHA:
 502       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target,
 503                                        sample_count, bindings, geom_flags ))
 504          return PIPE_FORMAT_L8A8_UNORM;
 505       return default_rgba_format( screen, target, sample_count, bindings,
 506                                   geom_flags );
 507
 508    case GL_INTENSITY:
 509    case GL_INTENSITY4:
 510    case GL_INTENSITY8:
 511    case GL_INTENSITY12:
 512    case GL_INTENSITY16:
 513    case GL_COMPRESSED_INTENSITY:
 514       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target,
 515                                        sample_count, bindings, geom_flags ))
 516          return PIPE_FORMAT_I8_UNORM;
 517       return default_rgba_format( screen, target, sample_count, bindings,
 518                                   geom_flags );
 519
 520    case GL_YCBCR_MESA:
 521       if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY, target,
 522                                       sample_count, bindings, geom_flags)) {
 523          return PIPE_FORMAT_UYVY;
 524       }
 525       if (screen->is_format_supported(screen, PIPE_FORMAT_YUYV, target,
 526                                       sample_count, bindings, geom_flags)) {
 527          return PIPE_FORMAT_YUYV;
 528       }
 529       return PIPE_FORMAT_NONE;
 530
 531    case GL_COMPRESSED_RGB:
 532       /* can only sample from compressed formats */
 533       if (bindings & ~PIPE_BIND_SAMPLER_VIEW)
 534          return PIPE_FORMAT_NONE;
 535       else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGB,
 536                                            target, sample_count, bindings,
 537                                            geom_flags))
 538          return PIPE_FORMAT_DXT1_RGB;
 539       else
 540          return default_rgb_format(screen, target, sample_count, bindings,
 541                                    geom_flags);
 542
 543    case GL_COMPRESSED_RGBA:
 544       /* can only sample from compressed formats */
 545       if (bindings & ~PIPE_BIND_SAMPLER_VIEW)
 546          return PIPE_FORMAT_NONE;
 547       else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_RGBA,
 548                                            target, sample_count, bindings,
 549                                            geom_flags))
 550          return PIPE_FORMAT_DXT3_RGBA;
 551       else
 552          return default_rgba_format(screen, target, sample_count, bindings,
 553                                     geom_flags);
 554
 555    case GL_RGB_S3TC:
 556    case GL_RGB4_S3TC:
 557    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 558       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGB,
 559                                       target, sample_count, bindings,
 560                                       geom_flags))
 561          return PIPE_FORMAT_DXT1_RGB;
 562       else
 563          return PIPE_FORMAT_NONE;
 564
 565    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 566       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGBA,
 567                                       target, sample_count, bindings,
 568                                       geom_flags))
 569          return PIPE_FORMAT_DXT1_RGBA;
 570       else
 571          return PIPE_FORMAT_NONE;
 572
 573    case GL_RGBA_S3TC:
 574    case GL_RGBA4_S3TC:
 575    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 576       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_RGBA,
 577                                       target, sample_count, bindings,
 578                                       geom_flags))
 579          return PIPE_FORMAT_DXT3_RGBA;
 580       else
 581          return PIPE_FORMAT_NONE;
 582
 583    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 584       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 585                                       target, sample_count, bindings,
 586                                       geom_flags))
 587          return PIPE_FORMAT_DXT5_RGBA;
 588       else
 589          return PIPE_FORMAT_NONE;
 590
 591 #if 0
 592    case GL_COMPRESSED_RGB_FXT1_3DFX:
 593       return PIPE_FORMAT_RGB_FXT1;
 594    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 595       return PIPE_FORMAT_RGB_FXT1;
 596 #endif
 597
 598    case GL_DEPTH_COMPONENT16:
 599       if (screen->is_format_supported(screen, PIPE_FORMAT_Z16_UNORM, target,
 600                                       sample_count, bindings, geom_flags))
 601          return PIPE_FORMAT_Z16_UNORM;
 602       /* fall-through */
 603    case GL_DEPTH_COMPONENT24:
 604       if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 605                                       target, sample_count, bindings, geom_flags))
 606          return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 607       if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 608                                       target, sample_count, bindings, geom_flags))
 609          return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 610       /* fall-through */
 611    case GL_DEPTH_COMPONENT32:
 612       if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_UNORM, target,
 613                                       sample_count, bindings, geom_flags))
 614          return PIPE_FORMAT_Z32_UNORM;
 615       /* fall-through */
 616    case GL_DEPTH_COMPONENT:
 617       {
 618          static const enum pipe_format formats[] = {
 619             PIPE_FORMAT_Z16_UNORM,
 620             PIPE_FORMAT_Z32_UNORM,
 621             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 622             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 623          };
 624          return find_supported_format(screen, formats, Elements(formats),
 625                                       target, sample_count, bindings, geom_flags);
 626       }
 627
 628    case GL_STENCIL_INDEX:
 629    case GL_STENCIL_INDEX1_EXT:
 630    case GL_STENCIL_INDEX4_EXT:
 631    case GL_STENCIL_INDEX8_EXT:
 632    case GL_STENCIL_INDEX16_EXT:
 633       {
 634          static const enum pipe_format formats[] = {
 635             PIPE_FORMAT_S8_USCALED,
 636             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 637             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 638          };
 639          return find_supported_format(screen, formats, Elements(formats),
 640                                       target, sample_count, bindings, geom_flags);
 641       }
 642
 643    case GL_DEPTH_STENCIL_EXT:
 644    case GL_DEPTH24_STENCIL8_EXT:
 645       {
 646          static const enum pipe_format formats[] = {
 647             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 648             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 649          };
 650          return find_supported_format(screen, formats, Elements(formats),
 651                                       target, sample_count, bindings, geom_flags);
 652       }
 653
 654    case GL_SRGB_EXT:
 655    case GL_SRGB8_EXT:
 656    case GL_COMPRESSED_SRGB_EXT:
 657    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 658    case GL_SRGB_ALPHA_EXT:
 659    case GL_SRGB8_ALPHA8_EXT:
 660       return default_srgba_format( screen, target, sample_count, bindings,
 661                                    geom_flags );
 662    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 663       return PIPE_FORMAT_DXT1_SRGB;
 664    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 665       return PIPE_FORMAT_DXT1_SRGBA;
 666    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 667       return PIPE_FORMAT_DXT3_SRGBA;
 668    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 669       return PIPE_FORMAT_DXT5_SRGBA;
 670
 671    case GL_SLUMINANCE_ALPHA_EXT:
 672    case GL_SLUMINANCE8_ALPHA8_EXT:
 673    case GL_COMPRESSED_SLUMINANCE_EXT:
 674    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 675       if (screen->is_format_supported(screen, PIPE_FORMAT_L8A8_SRGB, target,
 676                                       sample_count, bindings, geom_flags))
 677          return PIPE_FORMAT_L8A8_SRGB;
 678       return default_srgba_format( screen, target, sample_count, bindings,
 679                                    geom_flags );
 680
 681    case GL_SLUMINANCE_EXT:
 682    case GL_SLUMINANCE8_EXT:
 683       if (screen->is_format_supported(screen, PIPE_FORMAT_L8_SRGB, target,
 684                                       sample_count, bindings, geom_flags))
 685          return PIPE_FORMAT_L8_SRGB;
 686       return default_srgba_format( screen, target, sample_count, bindings,
 687                                    geom_flags );
 688
 689    default:
 690       return PIPE_FORMAT_NONE;
 691    }
 692 }
 693
 694
 695 /**
 696  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 697  */
 698 enum pipe_format
 699 st_choose_renderbuffer_format(struct pipe_screen *screen,
 700                               GLenum internalFormat, unsigned sample_count)
 701 {
 702    uint usage;
 703    if (_mesa_is_depth_or_stencil_format(internalFormat))
 704       usage = PIPE_BIND_DEPTH_STENCIL;
 705    else
 706       usage = PIPE_BIND_RENDER_TARGET;
 707    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D,
 708                            sample_count, usage);
 709 }
 710
 711
 712 /**
 713  * Called via ctx->Driver.chooseTextureFormat().
 714  */
 715 gl_format
 716 st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 717                        GLenum format, GLenum type)
 718 {
 719    struct pipe_screen *screen = st_context(ctx)->pipe->screen;
 720    enum pipe_format pFormat;
 721    uint bindings;
 722
 723    (void) format;
 724    (void) type;
 725
 726    /* GL textures may wind up being render targets, but we don't know
 727     * that in advance.  Specify potential render target flags now.
 728     */
 729    if (_mesa_is_depth_format(internalFormat) ||
 730        _mesa_is_depthstencil_format(internalFormat))
 731       bindings = PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_DEPTH_STENCIL;
 732    else
 733       bindings = PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_RENDER_TARGET;
 734
 735    pFormat = st_choose_format(screen, internalFormat,
 736                               PIPE_TEXTURE_2D, 0, bindings);
 737
 738    if (pFormat == PIPE_FORMAT_NONE) {
 739       /* try choosing format again, this time without render target bindings */
 740       pFormat = st_choose_format(screen, internalFormat,
 741                                  PIPE_TEXTURE_2D, 0, PIPE_BIND_SAMPLER_VIEW);
 742    }
 743
 744    if (pFormat == PIPE_FORMAT_NONE) {
 745       /* no luck at all */
 746       return MESA_FORMAT_NONE;
 747    }
 748
 749    return st_pipe_format_to_mesa_format(pFormat);
 750 }
 751
 752
 753 /**
 754  * Test if a gallium format is equivalent to a GL format/type.
 755  */
 756 GLboolean
 757 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 758 {
 759    switch (pFormat) {
 760    case PIPE_FORMAT_A8B8G8R8_UNORM:
 761       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 762    case PIPE_FORMAT_A8R8G8B8_UNORM:
 763       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 764    case PIPE_FORMAT_B5G6R5_UNORM:
 765       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 766    /* XXX more combos... */
 767    default:
 768       return GL_FALSE;
 769    }
 770 }
 771
 772 GLboolean
 773 st_sampler_compat_formats(enum pipe_format format1, enum pipe_format format2)
 774 {
 775    if (format1 == format2)
 776       return GL_TRUE;
 777
 778    if (format1 == PIPE_FORMAT_B8G8R8A8_UNORM &&
 779        format2 == PIPE_FORMAT_B8G8R8X8_UNORM)
 780       return GL_TRUE;
 781
 782    if (format1 == PIPE_FORMAT_B8G8R8X8_UNORM &&
 783        format2 == PIPE_FORMAT_B8G8R8A8_UNORM)
 784       return GL_TRUE;
 785
 786    if (format1 == PIPE_FORMAT_A8B8G8R8_UNORM &&
 787        format2 == PIPE_FORMAT_X8B8G8R8_UNORM)
 788       return GL_TRUE;
 789
 790    if (format1 == PIPE_FORMAT_X8B8G8R8_UNORM &&
 791        format2 == PIPE_FORMAT_A8B8G8R8_UNORM)
 792       return GL_TRUE;
 793
 794    if (format1 == PIPE_FORMAT_A8R8G8B8_UNORM &&
 795        format2 == PIPE_FORMAT_X8R8G8B8_UNORM)
 796       return GL_TRUE;
 797
 798    if (format1 == PIPE_FORMAT_X8R8G8B8_UNORM &&
 799        format2 == PIPE_FORMAT_A8R8G8B8_UNORM)
 800       return GL_TRUE;
 801
 802    return GL_FALSE;
 803 }